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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2598c46c62419440d1565c0c0162aa897e5a8f623cd6d3ab81f2d4fdd0e65ec' 
  AND token = 'T5VU0hBhAwjzFlRcJ63+e92UHw6zvYvnUMPP4U4jgY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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