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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd8a76ef72e1218aee2ab362579807486c41459a537c5ea66b8517f73fdee7bd' 
  AND token = 'BCQ9/jLWJTA04oYFHfvHjHykrkm83AU6Pw12TDgMOQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00134

JSON explain

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