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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f1a669c58b90e4606c6747f3685dba900d0a0714908e7f7900c91215d5a6055' 
  AND token = '7r6mLMy13axyPyEB4y5obu0oZlj1K9n6AVVwx64FArU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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