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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cd334e966394ef7f999aa460afea63f272f6681324848efd61ee1bfbd476def' 
  AND token = 'dH1z+ACNzGkdg0TIemP/Za2bjjJ4DUIxYf26Bn0a0mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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