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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd02133c05c9965a472da294e502773ce8f368fdf4c9898ef1e55ec93ce634855' 
  AND token = 'RAfmKNs74gMq78anvCmYQuH5/IRpaoOuYJKAo+5O63M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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