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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df0d69381a86978594cd6f73963db22acaac5e8afe2c81a6401baaefc8370f14' 
  AND token = 'ro4zSeZcReOpa/RooN6SMTmk9lKKfIP5I/4vG4L4/QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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