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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ce5564fabe3697d0deb1e0057f0208add184c965ca612fc8aa402316d14296c' 
  AND token = 'aIzagiR9c9i8vDqOtSJig0UtgtywLnZ1QsfO3N8DGgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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