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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a98705f49c1239df66026d5c2e2d18c035863a03c95f62d14f5a8ab02a57f3b' 
  AND token = 'e0wfT6Df5Qdke9w0M6dNm+ESwKg3mlkaJZOICrUocBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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