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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f34a66ab60ed5f0136760de966f6ef79004e2c78972c30da0d6da13a73f636a9' 
  AND token = 'a7d1MQNRCmAAAO7LbOziWSYs8i+64i+n7rooeJuMJRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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