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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1029db88befbf7687eed0f4243357cb46967844424f5faa78375f6a23d2929f2' 
  AND token = 'luRECyA7GVotysxFGn6cS1C/1tRdNP47/ObGIqfO3tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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