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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c443e6a4c9e18d85c1615526a223322bd976a1671c8297d2a00331a9eff97c7' 
  AND token = '5Uh/KV4DPbbcVay5lleZz8XkVEGjL7Usk92ToMwi6fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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