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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7838d5d1cd15ff5955db0626bd9bb262cb40962ead4294e40c4ad119c60647b' 
  AND token = 'Ua8H4LGkSuzIVjsVRfzTiQOyrFK/REaRM823y4KMTZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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