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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd37324777e8ab01fd423fa51021a03788618b1f5b6c0fe1b981b68bd2d133c8e' 
  AND token = '69mJmnz3CLo+4b84LahF812vdyTg6P4wI0qGJn8cXQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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