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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f1c03fd1cdfff1bc058becfa06ace6f6ce9128c7f95cb7c182e2ede0f973e8d' 
  AND token = 's3zQXDvA5EgyMBR7J0vBL0Q34bNvR9w2iS3nMzLEI9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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