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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a698e77f65a96fbd0c8876b255a4b791e8337ad92bccfeea0639390e7574f060' 
  AND token = 'Qx7QXl3PD/pRixchTIMvT8KL9ltz6+76+RjzlRAIkVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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