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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd43933518d317351b08bb41c2a809768a94743e115b5ffdf8975e5c85228e985' 
  AND token = 'oW4jNvwIBz0Z5bhvE++8BQi49Q4kkESVPFezYFZwUyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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