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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68d9bdcbe708ca1fcf91e100186627a29e191794dc573eac171e61b6b68f06c2' 
  AND token = 'Sa0egFCi4nTQ6PHMqBPKZ1DUji0/j55d1SoIL4cQP3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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