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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8926efc292cfbf4a30b695cae1df8fea25d718513fef1259834e29983aa196df' 
  AND token = 'DdT2xQVjiOjAhIi1nusn9FZtfncJEhPY/Son3vs/fZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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