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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ad47d6b93a6bcd0a6b0384e3e4e932d8537eef960ff9d4510c026a5e7ddc7d7' 
  AND token = '67u5TFjaphjXcoljQQCbgIvZ4iCWU+i6yE9dpyIJ6rI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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