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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01f5b344c7d42758c96b414a04fa4063114e2d7b47387cb223ca7434a8752ff1' 
  AND token = '6wcyZK4IvXfHXayt88sy6wQ9F4SPvzx26mMZEoIp9H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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