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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ea48c79b0e8ab3ca726d86f9dd7963d34ab2be988c5ddb9905d611f9d2a75e0' 
  AND token = 'MXcdo+b+Q/mfYxNmNjkNruQFtzzV8IrAOwQtieIJHwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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