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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0e6788244aea3a09f14c18738d089cf2571f5167a75b4dcd4e4c02841139e3e' 
  AND token = '4FrtPx689FOpAYccDj5gIcOeWGiPyOjkzQ+WSNMrEVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}