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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0989c9167de6f97a47c04782e5555e6e6d0e6ddfe9e3bc341fac4c029666de6f' 
  AND token = '8qeOCOpDSsMjlGx4UU5STGyI/2xf4Grd+BfHKAS6elY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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