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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cf6bffc456162ba3694ef98fc88347589d539697e8bfd0893113dcb9ef5f4f5' 
  AND token = 'Hfwh8ovh48WS1RlEhTlYN1FTzEnNrsxT7mDR8WzIBRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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