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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d2e37886da5e00e570da35c13126529b93cfc8b0e5b155a000494573704b000' 
  AND token = 'XgAlnk9w/NTeOVP3EtSHzUnU4qp2aetxt3PZ7wLVLaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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