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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed892b0e7046143c57d11f86732c60a04e6067eb1c46288c5922644be97de23d' 
  AND token = 'ovr0MvwBRJ05pjgQbeBrlsQnUZkWwKU8v20eRESHKo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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