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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd54537cae95b2f3b460e00843cb989d81d09180cabfe240423067d076b2928ac' 
  AND token = '/jpTzy3owrX0AGGHISNZ2ynlCLqDLguA3tCZMEkyfpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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