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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02d2e7e9f698881a268e694d9b09f58c29da427d7079c551a8a3d6d89669f904' 
  AND token = 'rthILb3NIe0oclLSfc8zbyYxxGCz5262UJ81umXL1ZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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