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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70a86bfca2a6bb19a3c2de0850d710a662135a5cd0686715b37c03c2d78b6a11' 
  AND token = '8X7wg1Zibw1nZODLNaY9Ivj8mgxhzf8afS95xfJwCbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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