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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9ba457f0411e8c7ca6efd985d0a4399cc1cc5df7c39efedebdd53870a6d404e' 
  AND token = 'aJEF+be3pK7LKvLnuAEd8+2inGA4U8/d7c4xhL8AOW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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