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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f77dcafc17e4dd737c44cdc4363ae4e0d3036db500c6e9cce9bb4878ecb73c6e' 
  AND token = 'zrXLUcQ8hCUATHRsVFh/zztjs9T5YegsbqX32Dc/0Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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