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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a572007e95e2a0e3d389fcb7a184f609d5efc08c4fc07fd2c76fd300f3e22a23' 
  AND token = 'Z4XGf7aEybRYuK2aTFS5/XqGJl+IuODg5uamgjEzKyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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