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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '429e5d92dd475e9dd37dcdea76bf9269be73404323160a08a53da14c7357560f' 
  AND token = 'eEDXaPFGkwlO37nv52AesOQnAYCRGKIkSuES63YSsuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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