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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f8720d107e2c52dea91903e853b17ac6bd5b75542e2ba472dff1b422cb9ef5c' 
  AND token = 'wsXE2ksE0BC6/6mUeB9ZcDrQdvgycePVr3VZkUwKBbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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