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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aaa92873dd22416a621a0161b41db986a9069aa17f8db5fc0292f1000d67588' 
  AND token = 'iwqRSla6VP+Qej49nyXUPT1fFuR5KoRou1rgX6HKN5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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