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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7932d933bbaf87d5f8a5ac24fe0bac72b407473a832caad6c4acff031c6443cc' 
  AND token = 'LqUQyzx61DxatuAuWEPb+DKdkPL8lwo1HxNbVt/5Nqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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