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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ae99bd5e75fcc0928651ffc9178c7c9860d31999cda70e55e3619d4ae2a6808' 
  AND token = '1g+e4Hvm/nouvNq+3jypEx/oidVDQ7e/GsiJLDFNLiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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