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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e2f817d05c2456654fe8272e7723905a8eef49da6e8036e2b7ebdce84ba1bde' 
  AND token = 'hsft6B0CgV2ppp7/AfA24eZJJWXkY5fPRMrMyA5sSMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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