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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7da3a472c76865157fd1c749c8249e269b18960a81ea8dab00a93854e2b14039' 
  AND token = '7P4kd2COBkxHSZV8pGGcubP9HShgkxj8s+jwnDCjZ4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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