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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10a83fb03b2c0d51dac94341ba6c16dead43f46780dde9650a119b28588689b1' 
  AND token = 'GhcrkhB/WnqUVKKWMXBNQ7JptXXW0GxHRb7m0nJG1Bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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