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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6d2c9db89dc75a7287b7ceab1a2314925e05e38c26910ab9c0cc00348b71072' 
  AND token = 'h7bUqxI6POR8DrMEoz573gW5XwMpyd8eh4p1Vz8FHoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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