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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdbf0adad32ee6ffd6fbe5ba9c48cd79f4b0fa4f73d0aa6fe752cfe71cad3786' 
  AND token = 'VTVNCGmnEeLk9iXrGMeLae1ym9YcQNXifsgr7v27/eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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