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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfc7b2470c752e127fd6e56003fa19fa4af84ca9ef30eb519f8bb95b6f630181' 
  AND token = 'hV1l5E2wssZBCNhx0xeIAY2qrdgecI7Hxz2eWKrxLdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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