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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28be538feffcd2583e7ea95d16ef67a3ad94b4bafba88cb1c91d3d6ad792d5f1' 
  AND token = '7ry+3NzECKsRbkjhCB77giGnnSYTSrg+WUDYBpb0zCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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