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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d840eff9f319ad924354c46d1680a4e588a148cca67d088807a9f57eafb3f06' 
  AND token = 'AjjEErguHHbOXdbEObuEO4Fmj7uzjhZSsg/5Xf0fYes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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