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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c95780c77775ad0a69aa8fb75a9b328d6048cf66dd328a4355fdcd5df9934040' 
  AND token = 'Bkde2gI4+XzBJv84ZlutjQJko0eE7KvZgIFpjkFhMO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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