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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca18fe5ff14e521f1646cd9a8b827ec4749a7a0ea1d6cec4e85f9916015c2dbf' 
  AND token = 'eIAr4B01I97X6boTXNFL8Q0PvkNCu2S0v0CfBwTYEgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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