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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '674f29dbec90a971857be2651e43be2d7ff86bda1ee6bb656b00d8860c5fafe5' 
  AND token = 'VVW+Z/0MM4J9r9xFpK/+OJk0wpY5QyNsbaHxPu5Sq8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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