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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04c974a4ba363cb4011d60e809c26ca92b1043dc8bab650cd530c43c56dc05e5' 
  AND token = '3QMbA/f2LzsBE34w7mLvQayCO/qUU9gEVgt/R5nqPxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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