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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d2041e09f791da9560aab21667e8a544f70e2e12883ea5911c2c5ae0ef657d1' 
  AND token = 'APY5RDyPB758QncKD0Rpqr9idY/iUUkNC0IcyN7R+AA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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