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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c578a1a273c94c0f96dcfa2dc25fdac50fd192af38442ea1e4a385c273df0c28' 
  AND token = 'AFz+Cwwsy4CcQPwJS7fg3wqy9bMIVheW5fKIxuvsU6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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