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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4cb3fc5887bea4231b238570a0189f1ebfac2c7851bc75ab4375419184dbb3a' 
  AND token = 'kTjG90qvq/9HJX0eM+FXr0RyzZr1Vyk8ZTAY1ldlE6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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