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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5ca48af534eb996090e21eda91f14d99e9f519f648008dc54538a5e9999ee9e' 
  AND token = '56j1aBrInJ5mu8WClgbcSObtiacK8ntLA0Y/L7yoL7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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