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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fd92b12849d35f85236b178ba71fcaafc4a5d7c84c18325f9f498ecc09b67c9' 
  AND token = 'GLWFyV1U+6zyyRliQry5YH7UePCEill3U0C+lzpReN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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