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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bb3e55678c06b5004a701bc3aeab53c7663c23f4f6414a5414d5881119aaa73' 
  AND token = 'nT9I6P8IkXBF5U35mHWoNJIBDQWLFPERSdYw37PZ43A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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